Bad service from Vodafone

I took out a Vodafone fibre contract last month (August). With this contract you get a free 100gig lte that you can use while you wait for the fibre installation. Within a few days a received my fibre router, more than a week later i received the lte. Connected it and it was not connecting to the internet. A week went by and numerous phone calls to customer service and multiple emails they sorted out the problem. The lte was connected for 3 days and then lost connection again. I've send emails etc, and still there is no connection. I wish to cancel this contract immediately without any cancellation fees, cause the fault is not on my side. They don't want to sort out the problem. I don't receive the service that they stated in the contract. I have send emails to cancel the contract, but they don't respond to them. I will never recomend them to anyone. They just want your money and then you don't get the service they offer. I still have all the emails I've send and their names. If they don't cancel this contract without any cancellation fees I'm going to take it further.